该液压系统采用特殊同心双缸来升降风洞顶门，并采用同步技术和液压锁闭技术来实现风洞顶门的升降。

The system makes use of the special concentric dual cylinder to lift and drop the wind tunnel door with the aid of synchronization and hydraulic locking technologies.

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一方面给出了检测门的物理结构设计，另一方面重点研究了检测门的同步升降控制系统。

On the one hand, Design the physical structure of beam-type ship draft testing gate, On the other hand, Focuses on the detection of synchronous lifting the door control system.

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